现在它们在英国、欧洲、还有 美国等地因荷兰榆树病（Dutch Elm disease）的关系，大约减少十分之一。这种病在十六世 纪时曾经出现过一次，那时有许多人死于传染病，尸体被埋在地磁线上，这对那些地磁线影...
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N a disease of elm trees caused by the fungus Ceratocystis ulmi and characterized by withering of the foliage and stems and eventual death of the parts of the tree above ground 荷兰榆树病
In both North America and Europe, fungus-causing diseases such as Dutch elm disease have killed off millions of stately trees that once gave beauty to forests and cities.
在北美和欧洲，像荷兰榆树病这样的真菌疾病已经杀死了数百万棵曾给森林和城市增光添彩的高大树木。
Holmes crossed two compatible races of ceratocystis ulmi, the causal agent of Dutch elm disease.
霍姆斯曾把荷兰榆病害的致病因子，长喙壳的两个亲和小种杂交。
The output was adjusted to the same pitch as the tree's screams and I threatened him with everything from falling branches to Dutch elm disease.
输出的信号被调整至与杨柳树的尖叫声一样的音调，我用各种可能来威胁他，从突然掉落的树枝，一直到荷兰榆树病，什么都有。
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